U.S. patent number 5,384,334 [Application Number 07/927,158] was granted by the patent office on 1995-01-24 for alkoxylated alkyl glucoside ether quaternaries useful in personal care.
This patent grant is currently assigned to Amerchol Corporation. Invention is credited to Amnon Friedman, Harold L. Moshel, Joseph P. Pavlichko, Stuart B. Polovsky.
United States Patent |
5,384,334 |
Polovsky , et al. |
* January 24, 1995 |
Alkoxylated alkyl glucoside ether quaternaries useful in personal
care
Abstract
Alkoxylated alkyl glucosides having quaternary
nitrogen-containing ether substituents possess cationics utility
combined with extreme mildness to skin and hair along with stable
personal care compositions and processes.
Inventors: |
Polovsky; Stuart B. (Old
Bridge, NJ), Moshel; Harold L. (Brooklyn, NY), Pavlichko;
Joseph P. (Helmetta, NJ), Friedman; Amnon (Marlboro,
NJ) |
Assignee: |
Amerchol Corporation (Edison,
NJ)
|
[*] Notice: |
The portion of the term of this patent
subsequent to August 11, 2009 has been disclaimed. |
Family
ID: |
23774814 |
Appl.
No.: |
07/927,158 |
Filed: |
August 7, 1992 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
447052 |
Dec 7, 1989 |
5138043 |
Aug 11, 1992 |
|
|
Current U.S.
Class: |
514/777; 424/59;
424/47; 536/17.2; 514/25; 514/23; 536/17.9 |
Current CPC
Class: |
C11D
1/62 (20130101); A61K 8/604 (20130101); A61Q
5/02 (20130101); C07H 15/08 (20130101); C09K
3/16 (20130101); C09K 8/206 (20130101); A61Q
5/12 (20130101); A01N 43/16 (20130101) |
Current International
Class: |
A01N
43/02 (20060101); A01N 43/16 (20060101); C11D
1/62 (20060101); C11D 1/38 (20060101); C09K
8/20 (20060101); C09K 3/16 (20060101); C09K
8/02 (20060101); C07H 15/08 (20060101); C07H
15/00 (20060101); A61K 047/00 (); C07H
015/00 () |
Field of
Search: |
;536/17.9,17.2
;514/777,23,25 ;424/47,59,401,78.03 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Other References
S B. Polovsky, et al., "Alkoxylated Methyl Glucoside Quaternaries:
A Series of New Raw Materials for Conditioning Shampoos", XIVth
I.F.S.C.C. Congress, Barcelona, Spain, 1986, vol. I, pp. 335-369.
.
P. Alexander, "Glucose Derivatives in Cosmetics", Manufacturing
Chemist, Sep. 1988, p. 61..
|
Primary Examiner: Rollins; John W.
Assistant Examiner: Peselev; Elli
Attorney, Agent or Firm: Volles; W. K.
Parent Case Text
This application is a continuation-in-part of Ser. No. 07/447,052,
filed Dec. 7, 1989, now U.S. Pat. No. 5,138,043, issued Aug. 11,
1992.
Claims
We claim:
1. Quaternary nitrogen-containing ether substituted, alkoxylated
alkyl glucoside compound represented by the structural formula:
##STR8## wherein: R.sub.w, R.sub.x, R.sub.y and R.sub.z are
ethylene or propylene;
R.sub.1 is C.sub.1-18 alkyl;
w, x, y and z provide an alkoxy molar substitution, MS, defined by
the average moles of alkoxy substituents represented by R.sub.w-z O
in the formula as the average sum of w, x, y and z, per mole of
compound, of from about 1 to about 200; and
R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are hydrogen, an
unsubstituted or oxygen-containing hydrocarbyl selected from the
group consisting of alkyl, cycloalkyl, phenyl and aralkyl having
from 1 to 26 carbon atoms, or a quaternary nitrogen-containing
group represented by the structural formula: ##STR9## wherein:
R.sub.6 is a hydroxyalkylene having from 1 to 10 carbon atoms;
R.sub.7, R.sub.8 and R.sub.9 are an unsubstituted or
oxygen-containing hydrocarbyl selected from the group consisting of
alkyl, cycloalkyl, phenyl and aralkyl having from 1 to 26 carbon
atoms; and
X is a halide, a sulfate anion, a phosphate anion or an organic
anion selected from the group consisting of mono and dibasic
carboxylic acids, oxylate, citrate, tartarate, toluene, sulfonate,
succinate and phthalate having from 1 to 18 carbon atoms;
provided that at least one R.sub.2, R.sub.3, R.sub.4 or R.sub.5 is
said quaternary nitrogen-containing group.
2. The compound of claim 1 wherein:
R.sub.w, R.sub.x, R.sub.y and R.sub.z are ethylene;
R.sub.1 is C.sub.1 -C.sub.6 alkyl;
MS is from about 10 to about 20; and
R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are hydrogen or said
quaternary nitrogen-containing group wherein:
R.sub.6 is C.sub.1-4 hydroxyalkylene;
R.sub.7, R.sub.8 and R.sub.9 are C.sub.1-18 alkyl; and
wherein the level of cationic substitution, CS, defined by the
average moles of quaternary nitrogen-containing groups per mole of
compound, is from about 0.05 to 4.
3. The compound of claim 2 wherein:
CS is about 0.30;
MS is about 10;
R.sub.1 is methyl;
R.sub.6 is hydroxyethylene;
R.sub.7 and R.sub.8 are methyl;
R.sub.9 is octadecyl; and
X is chloride.
4. Quaternary nitrogen-containing ether substituted, alkoxylated
alkyl glucoside compound represented by the structural formula:
##STR10## wherein: R.sub.w, R.sub.x, R.sub.y and R.sub.z are
ethylene;
R.sub.1 is C.sub.1-18 alkyl;
w, x, y and z provide an alkoxy molar substitution, MS, defined by
the average moles of alkoxy substituents represented by R.sub.w-z O
in the formula as the average sum of w, x, y and z per mole of
compound, of from about 10 to about 20; and
R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are hydrogen, or a quaternary
nitrogen-containing group represented by the structural formula:
##STR11## wherein: R.sub.6 is C.sub.1-4 hydroxyalkylene;
R.sub.7, R.sub.8 and R.sub.9 are C.sub.1-18 alkyl; and
X is a halide;
provided that at least one R.sub.2, R.sub.3, R.sub.4 or R.sub.5 is
said quaternary nitrogen-containing group; and
wherein the level of cationic substitution, CS, defined by the
average moles of quaternary nitrogen-containing groups per mole of
compound, is from about 0.05 to 4.
5. A personal care composition comprising a carrier and from about
0.1 to about 10 weight percent of a quaternary nitrogen-containing
ether substituted, alkoxylated alkyl glucoside compound represented
by the structural formula: ##STR12## wherein: R.sub.w, R.sub.x,
R.sub.y and R.sub.z are ethylene or propylene;
R.sub.1 is C.sub.1-18 alkyl;
w, x, y and z provide an alkoxy molar substitution, MS, defined by
the average moles of alkoxy substituents represented by R.sub.w-z O
in the formula as the average sum of w, x, y and z, per mole of
compound, of from about 1 to about 200; and
R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are hydrogen, an
unsubstituted or oxygen-containing hydrocarbyl selected from the
group consisting of alkyl, cycloalkyl, phenyl and aralkyl having
from 1 to 26 carbon atoms or a quaternary nitrogen-containing group
represented by the structural formula: ##STR13## wherein: R.sub.6
is a hydroxyalkylene having from 1 to 10 carbon atoms;
R.sub.7, R.sub.8 and R.sub.9 are an unsubstituted or
oxygen-containing hydrocarbyl selected from the group consisting of
alkyl, cycloalkyl, phenyl and aralkyl having from 1 to 26 carbon
atoms; and
X is a halide, a sulfate anion, a phosphate anion or an organic
anion selected from the group consisting of mono and dibasic
carboxylic acids, oxylate, citrate, tartarate, toluene, sulfonate,
succinate and phthalate having from 1 to 18 carbon atoms;
provided that at least one R.sub.2, R.sub.3, R.sub.4 or R.sub.5 is
said quaternary nitrogen-containing group.
6. The composition of claim 5 wherein the carrier is selected from
the group consisting of water, alcohols, aqueous alcohols, glycols,
water-in-oil emulsions, oil-in-water emulsions and mixtures
thereof.
7. The composition of claim 6 further comprising at least one
member selected from the group consisting of a surfactant, a
cleansing oil, a colorant, a preservative, a pH adjuster, an
emulsifier, a propellant, a reducing agent, a thickener, a
sunscreen agent, a suntan agent, a preservative and a
fragrance.
8. The compound of claim 1 wherein the unsubstituted or
oxygen-containing hydrocarbyl is selected from the group consisting
of methyl, ethyl, isopropyl, octyl, dodecyl, octadecyl, propenyl
cyclohexyl, phenyl and nonylphenyl.
9. The composition of claim 5 wherein:
R.sub.w, R.sub.x, R.sub.y and R.sub.z are ethylene;
R.sub.1 is C.sub.1-6 alkyl;
MS is from about 10 to about 20; and
R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are hydrogen or said
quaternary nitrogen-containing group wherein:
R.sub.6 is C.sub.1-4 hydroxyalkylene;
R.sub.7, R.sub.8 and R.sub.9 are C.sub.1-18 alkyl; and
wherein the level of cationic substitution, CS, defined by the
average moles of quaternary nitrogen-containing groups per mole of
compound, is from about 0.05 to 4.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to novel glucoside derivatives, and more
particularly to alkoxylated alkyl glucosides having quaternary
nitrogen-containing ether substituents and to their use in personal
care compositions and processes.
2. Description of Background Information
Cationics, i.e. cationic compounds such as quaternary
nitrogen-containing compounds, are useful in personal care such as
in conditioning hair and skin. Skin and hair adsorb cationics due
to the attraction of the positive charge on the cationic with the
negatively charged skin or hair surface. Cationics can penetrate
wet hair and interact with structural bonds within each hair fiber.
Cationics can provide lubricity to the hair which can reduce
tangling during wet and dry combing. Cationics can improve the
texture and softness of dry hair. Cationics can neutralize the
apparent anionic charge of the hair and, therefore, eliminate
static flyaway effect. Cationics provide such properties to hair
based on their substantivity to the hair.
While providing such advantageous personal care utilities,
cationics, however, are often toxic and irritating to the eye and
skin, depending upon the particular cationic structure and
concentrations. When used in higher concentrations, cationics have
been known to desensitize eyes to dangerous irritation and
occasionally produce corneal opacity and blindness. The utility of
cationics is therefore limited by their irritation potential.
Certain glucoside derivatives, such as alkoxylated alkyl
glucosides, possess mildness and low toxicity and can reduce the
irritancy of cosmetic formulations. See, for example, an article by
P. Alexander entitled "Glucose Derivatives in Cosmetics" in
Manufacturing Chemist, September 1988, page 61. Cationic,
alkoxylated alkyl glucosides having quaternary nitrogen-containing
ester substituents combine the functionality of cationics in
personal care with low toxicity and mildness associated with
alkoxylated alkyl glucosides. See, for example, a preprint by S. B.
Polovsky et al., entitled "Alkoxylated Methyl Glucoside
Quaternaries: A Series of New Raw Materials for Conditioning
Shampoos", for the XIVth I.F.S.C.C. Congress, Barcelona, Spain,
1986, Volume 1, pages 335-369. Such compounds, however, exhibit
instability limiting their utility such as in personal care
applications.
Other nitrogen-containing saccharide compounds have been developed.
Hydroxyalkylamino and quaternary nitrogen-containing ethers of
glycosides useful in cosmetic applications are described in U.S.
Pat. No. 3,931,148 (Langdon). Ethereal monosubstitutions of
monosaccharide derivatives useful in therapeutic compositions are
described in U.S. Pat. No. Re. 30,379 (Gordon). Quaternary ammonium
alkoxide alkoxy polyol compounds, including alkoxylated alkyl
glucosides, useful as epoxy resin flexibilizers are described in
U.S. Pat. No. 3,654,261 (Johnson).
It would be desirable if a class of compounds existed which
combines the utility of cationics along with mildness and low
irritancy and stability, particularly in personal care
applications.
SUMMARY OF THE INVENTION
Quaternary nitrogen-containing ether substituted, alkoxylated alkyl
glucoside compounds are provided represented by the structural
formula: ##STR1## wherein: R.sub.w, R.sub.x, R.sub.y and R.sub.z
are ethylene or propylene;
R.sub.1 is alkyl;
w, x, y and z provide an alkoxy molar substitution, i.e. MS defined
by the average moles of alkoxy substituents represented by
R.sub.w-z O in the formula as the average sum of w, x, y and z per
mole of compound, of from about 1 to about 200; and
R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are hydrogen, an
unsubstituted or oxygen-containing hydrocarbyl having from 1 to 26
carbon atoms or a quaternary nitrogen-containing group represented
by the structural formula: ##STR2## wherein: R.sub.6 is an
unsubstituted or oxygen-containing hydrocarbylene having from 1 to
10 carbon atoms;
R.sub.7, R.sub.8 and R.sub.9 are an unsubstituted or
oxygen-containing hydrocarbyl having from 1 to 18 carbon atoms;
and
X is a halide, an inorganic anion or an organic anion having from 1
to 18 carbon atoms;
provided that at least one R.sub.2, R.sub.3, R.sub.4 or R.sub.5 is
said quaternary nitrogen-containing group.
Personal care compositions and processes for managing keratinous
material using compositions comprising carrier, with or without
suitable personal care additives, and an effective managing amount
of such glucoside compounds are also provided.
DETAILED DESCRIPTION OF THE INVENTION
Quaternary nitrogen-containing ether substituted, alkoxylated alkyl
glucoside compounds of this invention possess the functionality of
cationics combined with the mildness and low irritancy of
alkoxylated alkyl glucosides as well as stability in personal care
formulations enabling widespread utility in personal care.
The glucosidic compounds of this invention are prepared from widely
available materials using standard syntheses. Glucosidic, i.e.
glucopyranosidic, starting materials useful to produce such
glucosidic compounds include, but are not limited to, alkyl
glucosides represented by structural Formula I. ##STR3##
In Formula I, each R represents hydrogen or an organic substituent.
The glucoside may have either enantiomeric configuration, i.e.
dextrorotatory (D--) or levorotatory (L--), with D-glucoside
generally preferred. The alkyl glucosides, which may be formed by
reacting glucosides with alkanol under acid catalysis, have an
alkyl substituent, represented by R.sub.1 in Formula I, at the
C.sub.1 atom of the glucoside ring. Preferably, R.sub.1 has from 1
to 18 carbon atoms, more preferably from 1 to 6 carbon atoms, such
as, for example, methyl, ethyl, isopropyl, tertiary butyl and
others. Most preferably R.sub.1 is methyl. Either alkyl isomer,
i.e. alpha or beta, can be used with alpha-beta blends of alkyl
glucoside generally preferred. Alkyl glucosides can be reacted with
alkylene oxides, using established procedures, to produce
alkoxylated alkyl glucosides, wherein one or more alkoxy
substituents on the C2-5 atoms of the glucoside ring are provided.
Alkoxylated alkyl glucosides may be represented by the structural
Formula II. ##STR4##
In Formula II, each R.sub.w, R.sub.x, R.sub.y, and R.sub.z
individually represents ethylene or propylene, including mixtures
thereof, and preferably are all ethylene. R.sub.1 is as defined
previously in Formula I. The number (average) of alkoxy groups at
each position is represented by w, x, y and z. The alkoxy molar
substitution, i.e. MS defined by the average moles of alkoxy
substituents represented by R.sub.w-z O in the formula as the
average sum of w, x, y and z per mole of compound, is greater than
0, generally from about 1 to about 200, preferably from about 2 to
about 120, and most preferably from about 10 to about 20. R.sub.2,
R.sub.3, R.sub.4 and R.sub.5 individually represent: (1) hydrogen,
in unsubstituted, alkoxylated alkyl glucosides; or (2)
unsubstituted or oxygen-containing hydrocarbyl substituents.
The term "hydrocarbyl", as used herein, means a substituent or
radical containing hydrogen and carbon atoms. The hydrocarbyl group
may have any suitable structure including saturated or unsaturated,
straight or branched chain, acyclic or cyclic or other structural
variations and it will typically have from 1 to 26 carbon atoms,
and preferably from 1 to 18 carbon atoms. Illustrative hydrocarbyl
groups include, but are not limited to: alkyl, such as methyl,
ethyl, isopropyl, octyl, dodecyl, octadecyl and so on; alkenyl,
such as propenyl and so on; cycloalkyl, such as cyclohexyl and so
on; aryl, such as phenyl and so on; and combinations like alkaryl
such as nonylphenyl, aralkyl, and so on. Oxygen-containing
hydrocarbyl substituents are the hydrocarbyl groups described above
which also have oxygen atoms present in any suitable form such as
in hydroxyl, ether, carbonyl, carboxyl, ester, heterocyclic or
other oxygen-containing groups.
Illustrative glucosidic starting materials include, but are not
limited to: glucose; alkyl glucosides, including ester or ether
derivatives thereof, such as methyl glucoside, ethyl glucoside,
methyl glucoside stearate (available as GLUCATE.RTM. SS from
Amerchol Corp.), methyl glucoside dioleate (available as
GLUCATE.RTM. DO from Amerchol Corp.), and other available
compounds; alkoxylated alkyl glucosides, including ester or ether
derivatives thereof, such as ethoxylated and/or propoxylated
glucosides including methyl gluceth-10, methyl gluceth-20, PPG-10
methyl glucose ether and PPG-20 methyl glucose ether, which are the
ten and twenty mole (average) ethoxylates and propoxylates of
methyl glucoside, respectively (available from Amerchol Corp. as
GLUCAM.RTM. E-10, GLUCAM.RTM. E-20, GLUCAM.RTM. P-10 and
GLUCAM.RTM. P-20, respectively), methyl gluceth-20 distearate or
PPG-20 methyl glucose ether distearate (available from Amerchol
Corp. as GLUCAM.RTM. E-20 Distearate or GLUCAM.RTM. P-20
Distearate, respectively), and methyl gluceth-20 sesquistearate
(available as GLUCAMATE.RTM. SSE-20 from Amerchol Corp.), and so
on. Preferred glucosidic starting materials include methyl
gluceth-10.
The glucosidic compounds of this invention can be produced by
reacting the glucosidic starting materials with nitrogen-containing
compounds as reactants. The nitrogen in such reactants may be
quaternized either before or after the reaction. Such
nitrogen-containing compounds may include those represented by
structural Formulas III and IV. ##STR5##
In Formula III, Q, either alone or in combination with R.sub.6,
represents a functional group which is capable of reacting, either
directly or after further reaction, with hydroxyl groups on the
glucosidic starting materials. Illustrative functional groups Q
include, but are not limited to: halides, such as chloride and
others; sulfonates, such as tosylate, mesylate and others. When Q
is combined with hydroxy substitution in R.sub.6, compound (III)
can be reacted with a base, such as sodium or potassium hydroxides
or others, to form an oxirane-containing intermediate which may be
represented by structural Formula V. ##STR6##
In Formulas III and V, R.sub.6 represents an unsubstituted or
oxygen-containing hydrocarbylene typically having from 1 to 10
carbon atoms, preferably from 1 to 4 carbon atoms; such as, but not
limited to: alkylene such as methylene or ethylene and so on;
hydroxy-containing alkylene such as hydroxymethylene,
hydroxyethylene and so on; and other oxygen-containing
hydrocarbylenes. Preferably R.sub.6 is hydroxyethylene or when
combined with Q represents oxyethylene having an oxirane ring
formed with the adjacent carbon atom.
In Formulas III, IV and V, the nitrogen substituents, i.e. R.sub.7,
R.sub.8 and R.sub.9 represent, individually or combined,
unsubstituted or oxygen-containing hydrocarbyl typically having
from 1 to 6 carbon atoms, preferably having from 1 to 18 carbon
atoms. Illustrative R.sub.7, R.sub.8 and R.sub.9 groups include,
but are not limited to: alkyl such as methyl, ethyl, propyl, butyl,
decyl, dodecyl, hexadecyl, octadecyl and so on; cycloalkyl such as
cyclohexyl; aryl such as phenyl or tolyl; or when two or more are
combined with each other form a heterocyclic nitrogen-containing
ring such as pyridinyl and so on. Preferably, two nitrogen
substituents are methyl and one is long chain alkyl, particularly
dodecyl.
In Formulas III and V, X represents an anion. Illustrative anions
include, but are not limited to: halides, such as chloride,
fluoride, bromide, and iodine; other inorganic anions such as
sulfate or phosphate; or organic anions having from 1 to 18 carbon
atoms such as mono and dibasic carboxylic acids, oxylate, citrate,
tartrate, toluene sulfonate, succinate, phthalate, or others.
The glucosidic starting materials may be reacted with the
nitrogen-containing reactants using established processes for
producing quaternary ammonium compounds. See, for example, the
procedures described in U.S. Pat. No. 3,884,977 (Molnar) or the
quaternization procedures described in U.S. Pat. No. 4,663,159
(Brode, II et al.). In one method, the glucosidic starting material
can be reacted with epichlorohydrin to form a chlorohydrin ether
intermediate which can be reacted with a tertiary amine, as in
Formula IV, to provide the quaternary derivatives. In another
method, the glucosidic starting material may be reacted with
halohydroxyalkyl trihydrocarbyl ammonium halide, such as
3-chloro-2-hydroxypropyl dimethyldodecyl ammonium chloride or
3-chloro-2-hydroxypropyl dimethyloctadecyl ammonium chloride, under
alkaline conditions to form the quaternary derivative.
The quaternization reaction can be conducted in the presence of
solvent, catalyst or other adjuvants. Typical solvents include, but
are not limited to: water; inert organic compounds including lower
aliphatic alcohols or ketones, such as isopropanol, butanol,
acetone or others; aliphatic or aromatic hydrocarbons; and other
useful solvents. Typical adjuvants to the reaction include, but are
not limited to: neutralizers, such as citric, acetic, tartaric or
other acids; decolorizing agents, such as molecular sieves,
activated carbon, e.g. NUCHAR.RTM. S-A or S-N, NORITE.RTM. A or SG,
CALGON.RTM. RC or BL, EMERSORB.RTM. S-402 or S-404, clays, e.g.
CLAROLITE.RTM. T-30 or T-60, FILTROL.RTM. Grade 4, 40 or 105,
sodium cyanohydridoborate, sodium tetrahydroborate, hydrogen/nickel
catalyst or others; filtering aids, such as diatomaceous earth; and
any other useful materials.
The relative amount of nitrogen-containing reactant to glucosidic
starting material is not critical and is generally at least an
amount sufficient to provide measurable quaternary substitution.
Typically, the molar ratio of nitrogen-containing reactant to
glucosidic starting material is from about 0.05:1 to about 5:1,
preferably from about 0.1:1 to about 4:1, and most preferably from
about 0.2:1 to about 1:1.
The conditions under which quaternization occurs are not narrowly
critical and are generally those conditions necessary to achieve
quaternization. The temperature may range from at or below room
temperature up to a temperature at which degradation occurs,
preferably from about 40.degree. C. to about 150.degree. C., and
most preferably from about 60.degree. C. to about 100.degree. C.
The pressure may range from less than 1 mm Hg up to or in excess of
one atmosphere, and is preferably at ambient conditions or under
vacuum. The reaction may be conducted for any time necessary to
achieve quaternization, generally from about one hour to about 100
hours, and most preferably from about three hours to about 48
hours.
In a typical embodiment, a reaction flask equipped with mechanical
stirrer and for nitrogen atmosphere is provided with glucosidic
starting material nitrogen-containing reactant, decolorizing agent
and stirred at 30.degree. C. with catalyst slowly added. The
reaction mixture is then heated to an appropriate reaction
temperature, typically 60.degree. C., and allowed to react for an
appropriate time, typically around 5 hours. Neutralizing agent is
then added to neutralize excess catalyst. The reaction mixture is
allowed to settle and the product isolated, typically using
filtration with filtration aids.
The glucosidic product of this invention may be represented by
structural Formula II, wherein R.sub.1, R.sub.w, R.sub.x, R.sub.y,
R.sub.z, w, x, y, z and X are as defined previously. R.sub.2,
R.sub.3, R.sub.4 and R.sub.5 are as defined previously in Formula
II with the additional provision that at least one R.sub.2,
R.sub.3, R.sub.4 or R.sub.5 represents a quaternary nitrogen group
represented by structural Formula VI. ##STR7##
In Formula VI, R.sub.6, R.sub.7, R.sub.8, R.sub.9 and X are as
defined previously in Formulas III and IV, provided that R.sub.6
when combined with functional group Q in Formula III represents the
residue of such functional group combination.
The glucosidic product contains a level of cationic substitution,
i.e. CS defined by the average moles of quaternary
nitrogen-containing groups per mole of compound, of greater than 0
based on the presence of one or more quaternary nitrogen-containing
groups in R.sub.2, R.sub.3, R.sub.4 or R.sub.5. CS is generally
from about 0.05 up to a maximum of 4, i.e. when each R.sub.2,
R.sub.3, R.sub.4 and R.sub.5 represents quaternary
nitrogen-containing groups. Preferably, CS is from about 0.1 to
about 4, and most preferably from about 0.2 to about 1. The
glucosidic product of this invention includes mixtures of various
quaternized alkoxylated alkyl glucosides alone or in combination
with alkoxylated alkyl glucosides free of quaternary substitution,
such as but not limited to when CS is less than 1.
Illustrative glucosidic products of this invention, generically
described as alkoxylated alkyl glucose ether (oxy)hydrocarbylene
tri(oxy)hydrocarbyl ammonium salts, include but are not limited to:
methyl gluceth-10 hydroxypropylene dimethyloctadecyl ammonium
chloride; methyl gluceth-10 hydroxypropylene dimethyldodecyl
ammonium chloride; methyl gluceth-5 hydroxypropylene
dimethyldocecyl ammonium bromide; methyl gluceth-5 hydroxypropylene
dimethyloctadecyl ammonium acetate; methyl gluceth-20
hydroxypropylene dimethylhexadecyl ammonium chloride; PPG-20 ethyl
glucose ether hydroxybutylene trimethyl ammonium bromide; PPG-10
methyl glucose ether hydroxybutylene dimethyldodecyl ammonium
iodide; PPG-5 methyl glucose ether hydroxypropylene dimethyloctyl
ammonium iodide; PPG-20 methyl glucose ether hydroxypropylene
dimethyloctadecyl ammonium acetate; and similar compounds.
Preferred glucosidic compounds of this invention are methyl
gluceth-10 hydroxypropylene dimethyldodecyl ammonium chloride and
methyl gluceth-10 hydroxypropylene dimethyloctadecyl ammonium
chloride.
The glucosidic compounds of this invention possess a desirable
balance of properties useful in personal care. As cationics, the
glucosidic compounds are substantive to keratinous material such as
hair and skin, providing a number of cosmetic utilities
representative of cationics. The glucosidic compounds also possess
mildness and low toxicity as compared to cationics in general,
thereby enabling their use in cosmetic applications otherwise
sensitive to cationics. In addition, the glucosidic compounds
exhibit improved stability in cosmetic formulations, as compared to
cationic alkoxylated alkyl glucosides having quaternary
nitrogen-containing ester substituents, thereby enabling their use
over a broad range of cosmetic applications.
Personal care compositions are provided comprising carrier, with or
without suitable care additives, and an effective managing amount
of the glucosidic compound of this invention.
The term "effective managing amount", as used herein, means an
amount of glycosidic compound of this invention, or mixtures
thereof, sufficient to provide a composition with personal care
utility. Typically, the amount of glycosidic compound of this
invention is at least about 0.05, preferably from about 0.1 to
about 10, and most preferably from about 0.25 to about 2.5 weight
percent of the composition. The remainder of the composition
comprises carrier and any suitable personal care additives.
The carrier may be any suitable carrier, or mixture of carriers,
which acts as a fluid vehicle for the composition. The type of
carrier is not critical and may be selected from any carrier
suitable to the particular application. Illustrative carriers
include, but are not limited to: water, such as deionized or
distilled water; emulsions, such as oil-in-water or water-in-oil
emulsions; alcohols, such as ethanol, isopropanol or the like;
glycols, such as propylene glycol, glycerine or the like; and
combinations thereof. Preferred carrier systems include
water-in-oil, oil-in-water or mixed water-in-oil-in-water
emulsions, water, ethanol and aqueous ethanol mixtures.
Suitable personal care additives can be selected from any suitable
substance which may be used to manage keratinous material,
including, but not limited to, one or more of the following.
Illustrative surfactants may include: anionics including fatty acid
soaps, alkyl sulfates, alkyl ether sulfates, alkyl or aryl
sulfonates, sulfosuccinates, sarcosinates, alkyl glucose esters or
their alkoxylates and in particular sodium lauryl sulfate, ammonium
lauryl sulfate, triethanolamine lauryl sulfate, sodium laureth
sulfate, alpha olefin sulfonate, disodium laureth sulfosuccinates,
triethanolamine stearate; nonionics including methyl glucose esters
or their alkoxylates, fatty acid alkanol amides, polyglycol ethers
or their alkyl or aryl derivatives, hydroxylated lanolin, lanolin
alcohols and in particular oleth-20, ceteareth-20, methyl glucose
dioleate, methyl glucose stearate, glycerol monostearate, cocoyl
diethanolamide, nonoxynol-7 and octoxynol-9; cationics including
alkyl trimethyl ammonium salts, quaternized amides of ethylene
diamine, alkyl pyridinium salts and in particular cetrimonium
chloride, stearalkonium chloride and cetyl pyridinium chloride; and
amphoterics including alkyl .beta.-aminopropionates, betaines,
alkyl imidazolines and in particular cocoamphocarboxy glycinate,
cocamidopropyl betaine and caproamphocarboxy propionate.
Illustrative cleansing oils or the like may include natural oils
and alcohols and in particular mineral oil, lanolin oil, jojoba
oil, sesame oil, ethanol and isopropanol. Illustrative colorants
may include pigments, dyes, and in particular FD&C Blue No. 1,
FD&C No. 1 Aluminum Lake or similar sets of green, red or
yellow. Illustrative preservatives may include alcohols, aldehydes,
p-hydroxybenzoates and in particular propylene glycol,
imidazolidinyl urea, methylparaben, propylparaben, glutaraldehyde,
ethyl alcohol and mixtures thereof. Illustrative moisturizers may
include 2-pyrrolidone-5-carboxylic acid and its salts and esters,
alkyl glucose alkoxylates or their esters, fatty alcohols, fatty
esters, glycols and in particular chitosan pyrrolidone carboxylate,
methyl glucose ethoxylates or propoxylates and their stearate
esters, isopropyl myristate, lanolin or cetyl alcohols, aloe,
silicones, propylene glycol, glycerol and sorbitol. Illustrative pH
adjustors may include inorganic and organic acids and bases and in
particular aqueous ammonia, citric acid, phosphoric acid, acetic
acid, triethanolamine and sodium hydroxide. Illustrative
emulsifiers may include anionic and nonionic surfactants and in
particular stearic acid, glycerol monostearate, cocoyl
diethanolamide, and the particular anionic and nonionic surfactants
listed previously. Illustrative propellants may include
hydrocarbons, fluorocarbons, ethers, carbon dioxide, nitrogen and
dimethyl ether. Illustrative reducing agents may include
hydroquinone, ammonium thioglycolate and sodium thioglycolate.
Illustrative thickeners may include salts and cellulosics and in
particular sodium chloride, water soluble cellulose derivatives
such as hydroxyethyl cellulose, and associative thickening
polymers. Illustrative sunscreen and suntan agents include para
amino benzoic acid (PABA) and its esters, cinnamates, salicylates,
oxybenzones and in particular ethyl dihydroxypropyl PABA,
octyldimethyl PABA, ethylhexyl p-methoxycinnamate, homomenthyl
salicylate and homosalate.
Other typical ingredients may include, but may not be limited to,
one or more of the following: fragrances; foaming agents;
depilatory agents; flavors; astringent agents; antiseptics;
deodorants; antiperspirants; insect repellants; bleaches and
lighteners; anti-dandruff agents; adhesives; polishes;
strengtheners; fillers; barrier materials; and other personal care
additives.
The amount of optional ingredients contained in the composition is
not critical but will vary depending upon the particular
ingredient, composition and desired use level and may be any
effective amount for achieving the desired property provided by
such ingredients, following established procedures.
Processes for managing keratinous material, including hair or skin,
by applying the personal care compositions of this invention to
keratinous material may be provided using established
techniques.
The glucosidic compounds of this invention may be useful in areas
other than personal care including but not limited to: health care;
fabric softening; pigments; textiles; flocculation; flotation;
precipitation; paints and printing inks; cleansers; oil field
applications; as antistatics; as anticaking agents; as adhesion
promoters; as herbicides; as corrosion inhibitors; as dispersants;
as germicides; as wetting and grinding aids; as preservatives; and
other areas where cationics or saccharides are useful.
Although not bound by any particular theory or mechanism, it is
believed that the glucosidic compounds of this invention are useful
based on a combination of factors. The presence of quaternary
nitrogen in the glucosidic compound contributes cationic activity
while the glucoside portion contributes mildness and low toxicity.
The absence of an ester linkage between the cationic substituent
and the glucoside avoids hydrolysis or saponification which would
result in degradation of the compound and lead to instability,
particularly under alkaline conditions used in many personal care
formulations.
The following examples are presented as illustrative embodiments of
this invention and are not intended to limit the scope thereof. All
of the parts, percentages and proportions referred to herein,
including the claims, are by weight unless otherwise indicated.
EXAMPLES
The various designations used in the examples have the following
meanings. Unless otherwise indicated, all materials are available
from Amerchol Corp. under the identified commercial names.
______________________________________ Designation Description
______________________________________ CARBOMER 1342 A copolymer of
acrylic acid and monomers containing carboxylic acid having a 1%
aqueous solution viscosity of about 19,000 cps, available as
CARBOPOL .RTM. 1342 from B. F. Goodrich Co. CHC N-55 Enzymatically
hydrolyzed animal protein having narrow molecular weight
distribution averaging around 1,500, available as Collagen
Hydrolyzate Cosmetic N-55. CHPMe.sub.2 C.sub.18 AmCl
3-chloro-2-hydroxypropyloctadecyl- dimethyl-ammonium chloride;
available from Degussa Chemical Co. as OUAB .RTM. 426 CHPMe.sub.2
C.sub.12 AmCl 3-chloro-2-hydroxypropyl dimethyldodecyl ammonium
chloride, available from Degussa Chemical Co. as QUAB .RTM. 342.
C.sub.16 OH&E-20 Cetearyl alcohol and ceteareth-20 mixture
available as PROMULGEN .RTM. D. C-24 Choleth-24 and ceteth-24
mixture available as SOLULAN .RTM. C-24. EDHP PABA Ethyl ester of
dihydroxypropyl para-amino benzoic acid having UV-B absorption
properties with a lambda maximum of 310 nm, available as AMERSCREEN
.RTM. P. Ethyl VME/MA Ethyl ester of vinyl methyl ether/maleic
anhydride copolymer, available as UCARSET .RTM. LP-250 Resin. HEC
Hydroxyethyl cellulose having an hydroxyethyl MS of about 2, a
molecular weight of about 1,000,000 and a 1% aqueous solution
viscosity of 4,400-5,600 cps, available as CELLOSIZE .RTM. Polymer
PCG-10. MG10HDAC1 Methyl gluceth-10 hydroxypropylene
dimethyldodecyl ammonium chloride having a CS of 0.25, produced as
described in Example 1. MG10HOAC1 Methyl gluceth-10
hydroxypropylene dimethyloctadecyl ammonium chloride having a CS of
0.3, produced as described in Example 3. MeG-DOE-120 A 120-mole
(average) ethoxylate of methyl glucose dioleate, available as
GLUCAMATE .RTM. DOE-120. MeGeth-10 Methyl Gluceth-10 having a
hydroxyl value of approximately 360, available as GLUCAM .RTM.
E-10. MeG SS Sesquistearate ester of methyl glucoside, available as
GLUCATE .RTM. SS. MeG SSE-20 A 20-mole (average) ethoxylate of
methyl glucose sesquistearate, available as GLUCAMATE .RTM. SSE-20.
OE-20 A 20-mole (average) ethoxylate of oleyl alcohol, available as
AMEROXOL .RTM. OE-20. Urea/BENS A broad spectrum preservative
having a mixture of diazolidinyl urea, methyl paraben and propyl
paraben in a propylene glycol base, available as GERMABEN .RTM. II
from Sutton Laboratories.
______________________________________
Unless otherwise indicated, the following test procedures are used
to measure product properties given in the examples.
Conditioning: The degree of conditioning is evaluated by applying
the material to hair or skin, as noted, and evaluating for wet or
dry feel, combing and appearance. Instron mechanical combing
properties are determined based on the technique described by M. L.
Garcia et al., J. Soc. Cosmet., Chem., Volume 27, pages 379-398
(September 1976).
CS: The extent of cationic substitution is calculated using the
following relationship:
wherein:
EW.sub.Q represents the equivalent weight of the quaternized
product, based on titration with standard sodium dodecyl sulfate
and CTFA Method D30-1;
MW.sub.g represents the average molecular weight of the glucosidic
starting material; and
MW.sub.N represents the molecular weight of the nitrogen-containing
substituent.
Saponification Value ("Sap Value"): The number of milligrams of
potassium hydroxide required to neutralize the free acids and
saponifiable ester groups in one gram of sample.
Hydroxyl Value: The number of milligrams of potassium hydroxide
necessary to neutralize the acetic acid released upon acetylation
with acetic anhydride of one gram of sample.
Irritation: A 3% aqueous solution of material, representing a
typical use level in cosmetics, is evaluated using standard primary
eye and dermal irritation analysis.
Acid Value: The number of milligrams of potassium hydroxide
required to neutralize the free acids in one gram of sample.
Substantivity: Two techniques predictive of substantivity, i.e.
adsorption on keratinous substrate, are used: (1) the Rubine Dye
test, such as described by R. J. Crawford et al., J. Soc. Cosmet.
Chem., volume 31, pages 273-278 (September/October 1980); and (2)
the "Zeta potential" measured with respect to time during a rinse
cycle in an electrokinetic streaming potential analysis, such as
described by E. D. Goddard, Cosmetics and Toiletries, April, 1987
pages 71-80.
Surface tension: Measured on a DuNouy Tensiometer using standard
procedures.
Toxicity: Acute oral toxicity of undiluted (100%) material, based
on standard LD.sub.50 analysis.
EXAMPLES 1 AND 2
These examples illustrate procedures for producing glucosidic
compounds of this invention. In Example 1, a single-step procedure
is presented by reacting quaternary nitrogen-containing reactant
with glucosidic starting material. In Example 2, a two-step process
is presented in which glucosidic starting material is modified to a
chlorohydrin intermediate which reacts with a tertiary amine to
produce the cationic product of this invention.
Example 1
Preparation of MG10HDACl
To a reaction vessel equipped with mechanical stirring and under
nitrogen blanket, 47.6 kg of MeGeth-10 and 19 kg of a 40% aqueous
solution of CHPMe.sub.2 C.sub.12 AmCl is added and stirred while
heating to 30.degree. C. at which time 4.3 kg of 45% aqueous
potassium hydroxide containing 68 g of sodium tetrahydroborate is
added slowly. The reaction mixture is then warmed to 60.degree. C.
and allowed to react for five hours. Then, at 60.degree. C., 964 g
of tartaric acid is added to neutralize the excess potassium
hydroxide. The reaction mixture is allowed to settle for about one
hour. The lower layer of salts and water, approximately 1 kg, is
removed. The upper layer is dried under full vacuum at 105.degree..
The product is then filtered to give 51.7 kg (94% yield) of methyl
gluceth-10 hydroxypropylene dimethyldodecyl ammonium chloride
(MG10HDACl).
The MG10HDACl has a CS of 0.25; an hydroxyl value of 314; a
nitrogen content of 0.45 weight percent; provides an ash content of
0.14%; and a 0.25% aqueous solution of the MG10HDACl gives a
surface tension of 30.7 dynes/cm as well as lowering the critical
micellar concentration of surfactants, and thereby reducing the
potential for irritation by lowering the amount of surfactant
needed when used. The MG10HDACl is soluble in water, ethanol,
glycerin and castor oil and insoluble in mineral oil and isopropyl
palmitate. The MG10HDACl is compatible with anionic surfactants
including sodium alpha-olefin sulfonate, sodium dodecyl sulfate,
sodium laureth-2 sulfate and triethanolamine dodecyl sulfate. The
MG10HDACl is nonirritating to the eye based on a Draize score of 0.
The MG10HDACl has moderate oral toxicity, exhibiting an LD.sub.50
of 3.25 ml/kg of body weight. The MG10HDACl possesses a dermal
irritation index of 0.17, which is classified as a nonprimary skin
irritant. The MG10HDACl is substantive based on strong coloration
of wool and hair switches by a 1% aqueous solution subjected to
Rubine Dye analysis and strong adsorption characteristics over a
60-minute period of rinsing during electrokinetic streaming
potential analysis. The material gives a residual "feel" to hair
after treatment, produces a gloss or sheen on hair tresses,
improves wet and dry combing based on subjective analysis as well
as strongly reducing the force required during mechanical hair
tress combing analysis. The MG10HDACl did not interfere with the
foaming characteristics of various anionic and amphoteric
surfactants, based on a representative weight ratio of surfactant
to MG10HDACl of 10:1.
Example 2
I. Preparation of Intermediate Chlorohydrin
In a round bottom flask equipped for nitrogen atmosphere, 85.7 g
(0.135 moles) of MeGeth-10 is stirred and warmed to 70.degree. C.
At this point 0.3 ml of BF.sub.3 *etherate is added via injection
and the temperature raised to 85.degree. C. Through an addition
funnel, 13.0 g (0.141 moles) of epichlorohydrin is added dropwise.
The reaction temperature is increased to 95.degree. C. and
maintained for at least a half hour. The mixture is then allowed to
cool to room temperature whereupon 5 g of activated alumina and 100
ml of acetone are added. The mixture is stirred for another
half-hour and vacuum filtered through filter paper. The solvent is
flash evaporated and the product dried in vacuum oven overnight.
This gives 95.7 g (97% yield) of a straw-colored, translucent,
viscous syrup.
II. Preparation of Cationic Product
In a reflux apparatus 15.4 g (21 mmoles) of the chlorohydrin adduct
produced in step I, 7.5 g (35.25 mmoles) of dimethyldodecylamine
and 30 ml of butanol are stirred. The mixture is brought to reflux
at approximately 120.degree. C. for 34 hours. After the butanol is
distilled off at 70.degree. C. and 100 mm Hg, the temperature is
raised to 150.degree. C. at 1 mm Hg to remove the excess
dimethyldodecylamine. At room temperature enough citric acid,
approximately 0.05 g, is added until a 1% aqueous solution of this
mixture is at a pH of approximately 6. The mixture is then water
purged at approximately 70.degree. C. and 135 mm Hg with 6 ml
deionized water. The methyl gluceth-10 hydroxypropylene
dimethyldodecyl ammonium chloride thus obtained is a brick red,
viscous liquid which is water soluble and as a 10% aqueous solution
has a pH of 6.8. This gives 19.8 g of a dark, viscous liquid as
product (96% yield). The CS of the product is 0.87.
Example 3
Preparation of MG10HOACl
MeGeth-10 (528 grams, 0.8 moles) and 252.5 grams (0.237 moles) of a
40% aqueous solution of CHPMe.sub.2 C.sub.18 AmCl were charged to a
2-liter neck round bottom flask equipped with a stirrer,
thermometer, reflux condenser, dropping funnel and nitrogen inlet
tube. A 45% aqueous KOH solution (45.9 grams, 0.38 moles) was
introduced slowly through the dropping funnel into the mixture
while stirring and nitrogen purging. The mixture was heated at
60.degree. C. for five hours. Tartaric acid (about 10 grams) was
added to neutralize excess KOH and adjust the pH to 6. Water was
removed by heating to 110.degree. C. with vacuum at <1 mm Hg.
About 10 grams of diatomaceous earth was added to the melt at
70.degree. C., which was then filtered. This produced 585.5 grams
(97.5% yield) of clear, light brown product, MG10HOACl.
The analytical values of the product are listed below:
TABLE 1 ______________________________________ Analytical Values
Ingredient Amount ______________________________________ % Water:
0.07 % Ash: 0.2 Acid Value: 1.30 Sap. Value: 2.16 Hydroxyl Value:
379.8 % 1,2-Propanediol:* 5.5 (by GC analysis) CS: 0.3
______________________________________ *1,2-Propanediol is a
solvent in the CHPMe.sub.2 C.sub.18 AmCl sample.
EXAMPLES 4-7
Personal Care Compositions
Illustrative personal care compositions are prepared and evaluated
in these examples using MG10HDACl produced as in Example 1.
Example 4
Clear Conditioning Shampoo
Clear conditioning shampoo is prepared by heating deionized water
to 60.degree. C. With propeller agitation, the additives listed in
Table 1 are then added separately, waiting for each ingredient to
dissolve before adding the next. When clear, the MG10HDACl is added
and the composition cooled to room temperature. The formulation has
a pH of 6 and a viscosity of 1700 cps.
When used in this clear shampoo, the MG10HDACl provides
conditioning properties and shine to the hair.
TABLE 2 ______________________________________ Clear Conditioning
Shampoo Formulation Ingredient Amount
______________________________________ MG10HDAC1 1.00% Citric acid
0.50 MeG DOE-120 3.50 Urea/BENS 1.00 Triethanolamine-lauryl sulfate
(40% aqueous) 25.00 Lauramide diethanolamine 5.00 Deionized water
64.00 ______________________________________
Example 5
Hair Conditioner
Hair conditioner containing the ingredients listed in Table 3 is
prepared by adding the HEC to the water at room temperature with
propeller agitation. The mixture is then heated to 75.degree. C.
When the polymer is fully hydrated, the MG10HDACl, CHC N-55,
MeGeth-10 and methyl paraben, are dissolved, in that order, waiting
for each to dissolve before adding the next. In a separate
container, the C.sub.16 OH&E-20 and cetyl alcohol are mixed.
Both mixtures are heated to 75.degree. C. and then added together
with mixing until a uniform mixture is produced, followed by
cooling to room temperature with adequate mixing.
When used in this hair conditioner, the MG10HDACl, being
substantive to the hair, provides for good wet combing,
manageability, shine and feel properties.
TABLE 3 ______________________________________ Hair Conditioner
Formulation Ingredient Amount
______________________________________ MG10HDAC1 2.50% HEC 0.63
Cetyl alcohol 1.20 CHC N-55 0.30 MeGeth-10 1.00 Methyl paraben 0.15
C.sub.16 OH&E-20 4.50 Deionized water 89.72
______________________________________
Example 6
Styling-Conditioning Mousse
Style-conditioning mousse is prepared containing the ingredients
listed in Table 4 by heating the deionized water to 60.degree. C.
and then dissolving the MG10HDACl, OE-20 and Urea/BENS. This
solution is then cooled to 40.degree. C. In a separate container
the Ethyl VME/MA, aminomethyl propanol and EDHP PABA are dissolved
in the alcohol. The two phases are then mixed until uniform.
Aluminum mousse cans are filled with this mixture and charged with
A-46 propellant, i.e. a mixture of hydrocarbon propellants
consisting of 80% isobutane and 20% propane, in a ratio of 95%
product and 5% propellant.
When used in this styling-conditioning mousse, the MG10HDACl
conditions the hair and contributes to the fixative properties of
the Ethyl VME/MA to give good curl retention. In addition, the
MG10HDACl plasticizes the Ethyl VME/MA for a more natural look.
TABLE 4 ______________________________________ Styling-Conditioning
Mousse Formulation Ingredient Amount
______________________________________ MG10HDAC1 0.25% OE-20 1.00
EDHP PABA 0.50 Ethyl VME/MA 5.00 Aminomethyl propanol* 2.20 SD
Alcohol 40 15.00 Deionized water 75.05 Urea/BENS 1.00
______________________________________ *10% solution in SD alcohol
40, providing 20% stoichiometric neutralization
Example 7
Cream
Cream containing the ingredients listed in Table 5 is prepared by
dissolving the CARBOMER 1342 in the deionized water and then
heating the solution to 80.degree. C. In a separate container, the
MeG SS, MeG SSE-20, C-24 and cetyl alcohol are added together,
heated to 80.degree. C. and mixed until uniform. The two mixtures
are then mixed together until uniform. The propylene glycol and
Urea/BENS are then dissolved in the mixture. The triethanolamine is
then added so that the mixture will thicken. The MG10HDACl is then
slowly added to the composition while mixed until uniform. The
composition is then cooled to room temperature with mixing.
When used in this cream, the MG10HDACl provides moisturizing and
conditioning properties while also providing slip for ease of
application.
TABLE 5 ______________________________________ Cream Formulation
Ingredient Amount ______________________________________ MG10HDAC1
2.00% CARBOMER 1342 0.30 Cetyl alcohol 0.50 MeG SS 1.50 MeG SSE-20
1.50 Urea/BENS 1.00 Propylene glycol 5.00 C-24 0.50 Triethanolamine
(10% aqueous solution) 4.58 Deionized water 83.12
______________________________________
Example 8
Stability Analysis
The stability of MG10HDACl is compared with the stability of the
chloride salt of the dimethyldodecyl ammonium acetate derivative of
methyl gluceth-10 (the "ester equivalent") having a CS of 0.85,
produced as described in the previously noted preprint by S. B.
Polovsky et al. This latter compound has the same structure as
MG10HDACl except that the quaternary substituent is connected to
the glucoside by an ester linkage instead of an ether linkage. The
hydrolytic stability of 10% aqueous solutions of both compounds is
presented in Table 6, based on the pH of the solutions over time.
The sharp drop in pH exhibited by the ester derivative indicates
the ester linkage breaks apart by hydrolysis to form methyl
gluceth-10 and the corresponding alcohol of the quaternary nitrogen
substituent. In contrast, the pH of the MG10HDACl is essentially
unchanged demonstrating long term stability.
TABLE 6 ______________________________________ pH Stability* Time
MG10HDAC1 Ester Equivalent ______________________________________
Initial 5.85 6.86 1 Day 4.82 5 Days 3.8 6 Days 3.72 7 Days 5.9 3.69
8 Days 3.42 15 Days 3.06 20 Days 5.25 22 Days 2.89 28 Days 2.9 30
Days 5.21 60 Days 5.66 ______________________________________
*based on 10% aqueous solutions, at room temperature.
* * * * *